Dust collector



July g, T1941. R. LITTLE DUST COLLECTOR Filed Oct. 26, 1940 2Sheets-Sheet 1 In mentor Z a Wmz-d L iff/ July 8, 394-1 R. LHTTLE2,248,181

DUST COLLECTOR Filed Oct. 26, 1940 2 Sheets-Shet 2 Inventor m m 41% Me Aitorneys with the interior Patented July 8, 1941 UNITED STATES PATENTOFFICE I wartime-me I Raymond Little, D'ccatur Ind. IAlllluclflolaocchml sir-glue. 363,0?9 I This invention relates to a dustcollector for freeing air of dust andis especially adapted for use ingrain grinding mills and similar places where there is a constant dangerof explosions from dust-laden air. The primary object of the inventionis the provision of a device of this character'in which dust-laden airmay be forced'and caused to travel in cyclone fashion to bring aboutseparation of the air and dust and permit the dust to gravitate out of gthe device for collection while the air may pass upwardly and outwardlysubstantially free of dust.

" Another object o1 the invention is the'provision of adjustable baiilesfor regulating the flow "of air upwardly and outwardly oi the device toassist in removing dust from the air and are regulated in accordancewith the amount oi. dust which may be in the air as said air leaves thedevice.

With these and other objects in view, the invention consists in certainnovel features of construction, combination and arrangement of parts tobe hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawings, in which Figure lis a side elevation illustrating a dust collector constructed inaccordance with my invention.

Figure 2 is a top same.

plan view illustrating the Referring in detail to the drawings, thenumeral 5 indicates an outer casing including a cylindrical portion 8and a substantially funnelshaped portion I providing a discharge neck 8{or dust. The upper end of the cylindrical portion '8 is closed by a topwall 8 and connected 0! the casing and formed on the side thereofadjacent, the top wall is an inlet pipe III. This pipe may be suitablemanner to a grain grinding machine so that the dust-laden air forcedfrom the machine may pass directly into the casing I. Arranged centrallyoi the casing i is a tubular sleeve II, the lower end of whichtermiconnected in any Figure 3 is a sectional view taken on the line 3-3of Figure 1.

states at the beginning of the funnel-shaped portion 'I while the upperend terminates in a plane above the top wall 9.

A substantially conical shaped deflector l2 surrounds a portion of thesleeve II and is formed on the latter and spaced from the walls of thecylindrical portion 6 of the casing, The deflector I2 is located belowthe inlet pipe It! so that on the dust-laden air entering the casing itis caused to travel downwardly in a swirling motion into thetunnel-shaped portion 1 where the dust settles by gravitation and passesoutwardly of the outlet neck 8 and may be collected in a suitablecollection means connected to said neck, while through the sleeve l land substantialthe air-'aises upwardly escapes from the upper endthereof ly free of dust. v

Struck-out portions it are formed on the substantially conical shapeddeflector to assist in causingthe air to travel in a swirling motion,and to aid in the separation of the dust from the air by catching dustand directing it into the deflector where it may gravitate into thefunnel-shaped portion of the outer casing 5 for discharge therefrom.However, should some of said dust be caught in an upwardly flowing Istream of air it may escape by way of the struckout portion-s l3 andbecome merged into the incoming flow oi dust-laden air for recirculationtherewith.

A plurality of superimposed and staggeredly arranged baifles H areformed on the inner walls of the sleeve and depend downwardly and spacednaled in the upper portion of the sleeve and to I which a hand lever 21is connected. Associated with the hand lever is an indicator plate 22hearing suit-able indici-a to indicate the position ofthe dampers inaccordance with the position occupied by a pointer or indicator 23forming a portion of the attached end of the handle 2|. The indicatorplate 22 has an arcuate slot 2 through which extends a bolt 25 of thehand lever 2|. A wing nut 26 is turned onto the bolt to engage the handlever and thereby bring abouta binding of the bolt on the indicatorplate for releasably securing the hand lever in its adjusted position.

It is to be understood that the links-l1 are pivotally connected totheir respective dampers.

Arranged above the upper end of the sleeve I I and spaced therefrom is ahood 2! including a conical shaped member 28 and an inverted conicalshaped member 29. The hood is supported by legs 38) fastened on thesleeve. The purpose of the hood is to deflect the air and spread thesame in various directions as it leaves the upper end of the sleevesubstantially free of dust.

The flow of air through the sleeve may be varied by varying or changing[the position of the dampers with respect to the baflles for the purposeof increasing and decreasing the action of the baflies on the air. Theadjustment of the dampers is made in accordance with the amount of dustthat may be in the air as it leaves the upper portion of the sleeve.

The opening 30' provided'in the sleeve ll connects the interior of saidsleeve with the outer casing 5 between the upper and lower groups ofbaffles. There will be a certain amount of dust rising in the sleeve IIwhich strikes the bailies and is directed outwardly by said baflles andmay escape through the opening 30' to meet the incoming dust-laden airfor recirculation therewith. This arrangement, to a great extent, willprevent clogging of the baiiles.

While I have shown and described the preferred embodiment of myinvention, it will be understood that minor changes in construction,

made without departing from the spirit and scope of the invention asclaimed.

Having thus described my invention what I claim is:

1. A dust collector comprising a casing having an air inlet and a dustoutlet, a sleeve rising centrally from said casing and providing an airoutlet, means carried by said sleeve and arranged in said casing todeflect the air from the air inlet downwardly in the casing with aswirling motion to the lower end of the sleeve for passage upwardlytherethrough, staggeredly arfor regulating the flow of air through theopenings of the baflies, and means for adjusting the position 01' thedampers.

2. A dust collector comprising a casing having an air inlet and a dustoutlet, a. sleeve rising centrally from said casing and-providing an airoutlet, means carried by said sleeve and arranged in said casing todeflectthe air from the air inlet downwardly in the casing with aswirling shaft.

combination and arrangement of parts may be 3. A dust collectorcomprising a casing having an air inlet and a dust outlet, a, sleeverising centrally from said casing and providing an air outlet, meanscarried by said sleeve and arranged in said casing to deflect the airfrom the air inlet downwardly in the casing with a swirling motion tothe lower end of the sleeve for passage upwardly therethrough,staggeredly arranged baffies arranged in said sleeve and havingopenings, hinged dampers carried by said baffles for regulating the flowof. air through the openings of the baflles, means connecting saiddampers, an operating shaft journaled in said sleeve and connected withsaid means, and a releasably secured hand lever secured to said shaft,and a hood arranged above and spaced from the upper end of the sleeveand mounted on the latter.

4. In a device oi' the character described, a

casing having an air inlet and a dust outlet, a

ranged bafiles arranged in said sleeve and having I openings, hingeddampers carried by said baflies sleeve rising centrally from said casingand carried thereby, a substantially cone-shaped deflector mounted onsaid sleeve below the air inlet and spaced from'the walls of the casing,staggered baflies arranged in said sleeve and having openings, hingedlymounted dampers for-said openings, and an operating means connected tothe dampers.

RAYMOND LITTLE.

